<div class="navbar navbar-inverse navbar-fixed-top">
  <div class="container">
    <div class="navbar-header">
      <button class="navbar-toggle collapsed" type="button" data-toggle="collapse" data-target=".navbar-collapse">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand hidden-sm" href="#">Gulp Demo</a>
    </div>
    <div class="navbar-collapse collapse" role="navigation">
      <ul class="nav navbar-nav">
        <li><a href="index.html">index</a></li>
        <li><a href="coffee.html">coffee</a></li>
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      </ul>
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        <li><a href="/about/">关于</a></li>
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</div>
